So if this sort of "insider trading" is bad, what does this mean for other sorts off strategies hedge funds do to get an edge, like flying helicopters to look at how full oil storage tanks are? Should that be banned too? The article basically argues that any sort of edge is bad because it disincentivizes others from participating. edit: see my subsequent comment. I'm not saying corruption is good. The whole point of…
There are differences between the insider trading and your helicopter example. The theory is the better traders know the reality when making decisions, the better. When oil traders hide information about their reserves, they are working on creating a rift between the reality and the public knowledge. Helicopter is overcoming it. When Trump makes empty announcements that change prices in a purely speculative manner, but before doing this he buys futures, he is just creating instability on the market and he exploiting it. Instability is bad, the whole idea of futures is to deal with the risks stemming from the instability.
Instability is bad, but when the cause of it is market getting new information, it becomes ok: it is bad now, but it is good in the long term. But when the instability becomes a source of profits, when there are incentives and means to create the instability, then long term benefits go away.